Extech Instruments Moisture Meter with Ball Sensor MO57

with Ball Sensor. Compact Pin Moisture Meter. Displays moisture level in wood and building materials such as wall board, sheet rock, cardboard, plaster, concrete, and mortar. Audible Alert - Tone rate beeps faster as the moisture level increases. Icons display low, medium and high levels of moisture content. Easy-to-use, compact-sized design. Data Hold freezes reading on display. Built-in battery level check and measurement verification test. Auto Power Off conserves battery power.